| ISAA LIMITED | Private company limited by shares | Dissolved |
| ISAAC LIMITED | Private company limited by shares | Live |
| ISAAC CO., LIMITED | Private company limited by shares | Dissolved |
| CYC ISAAC CO., LIMITED | Private company limited by shares | Live |
| ISAAC HP CO., LIMITED | Private company limited by shares | Live |
| ISAAC LANGHAM PLACE CO., LIMITED | Private company limited by shares | Live |
| Isaac Scientific Publishing Co., Limited | Private company limited by shares | Live |
| ISAAC TECHNOLOGY CONSULTANT CO., LIMITED | | Live |
| ISAAC Consulting Limited | Private company limited by shares | Live |
| ISAAC INDUSTRIAL (QING DAO) COMPANY LIMITED | Private company limited by shares | Live |
| Isaac IT Development Company Limited | | Live |
| Isaac DreamWorks Company Limited | Private company limited by shares | Dissolved |
| Isaac Mechanical Engineering Limited | | Live |
| ISAAC JEWELER GROUP (HK) CO., LIMITED | Private company limited by shares | Live |
| ISAAC ONE HOLDING LIMITED | | Live |
| ISAAC TWO HOLDING LIMITED | | Live |
| ISAAC 0129 HOLDING LIMITED | | Live |
| ISAAC HOLDINGS (INTERNATIONAL) LIMITED | Private company limited by shares | Dissolved |
| ISAAC HONG KONG CO., LIMITED | Private company limited by shares | Live |
| Fair Isaac Hong Kong Limited | Private company limited by shares | Live |
| ISAAC HONGKONG LIMITED | Private company limited by shares | Live |
| ISAAC TRADE (HONGKONG) LIMITED | Private company limited by shares | Live |
| ISAAC IMPORT&EXPORT COMPANY LIMITED | Private company limited by shares | Live |
| ISAAC INTERNATIONAL LIMITED | Private company limited by shares | Dissolved |
| ISAAC MEI INTERNATIONAL GROUP (HK) LIMITED | Private company limited by shares | Dissolved |
| ISAAC INVESTMENTS LIMITED | Private company limited by shares | Dissolved |
| Isaac & Jacob's Investment Company Limited | Private company limited by shares | Live |
| ISAAC LOGISTICS LIMITED | Private company limited by shares | Live |
| ISAAC & PATRICK ASSOCIATE LIMITED | Private company limited by shares | Live |
| ISAAC SEARCH LIMITED | Private company limited by shares | Live |
| Isaac & Teo Digital Solutions Limited | Private company limited by shares | Live |
| Isaac Spellman Studio Limited | | Live |
| Isaac BB Trading Limited | Private company limited by shares | Live |
| ISAAC TRADING LIMITED | Private company limited by shares | Live |
| ISAAC TRADING COMPANY LIMITED | Private company limited by shares | Live |
| ISAAC ROTCHES TRENDS LIMITED | Private company limited by shares | Live |
| Isaac Wong Limited | Private company limited by shares | Live |
| iSAACMA (HK) Co. Limited | Private company limited by shares | Live |
| ISAACNKY HOLDING LIMITED | | Live |
| ISAACS ENTERPRISES LIMITED | Private company limited by shares | Dissolved |
| Isaacspace Limited | Private company limited by shares | Live |
| ISAAC-TUNG TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ISAAN NETWORK LIMITED | Private company limited by shares | Dissolved |